There was a previous post on this route. Last year we priced it for a one way crossing in September 2023 using their contact form and it was around €600.
They don’t allow pets and the departure and arrival time didn’t suit us.
Below is a comment I made on the previous post.
I agree if you don’t have a pet and you want to save 500km of extra driving from Cherbourg and if you are heading to Holland, Belgium or Germany it’s a nice alternative. Crossing time leave at midnight ish and arrives at midnight as well. That puts me off though.
All booking via a contact form!! It needs to improve its offering and booking system for me though.